Fluid pressure actuator



Jan. 24, 1933. w. c. LEONARD FLUID PRESSURE ACTUATOR Filed Jan. 2, 1929 Patented Jan. 24, 1933 UNITED STATES WELDON G. LEON RD, 0F DAISETT'A, TEXAS, ASSIGNOR OF ONE-HALF TOMCHARLES i PATENT oFFilcs IJISMAN, OF LIBERTY COUNTY, TEXAS FLUID PRESSURE no'rnero'nj Application filed. January 2, 929. Seria1 No 32 9 7"? 2.

This invention relates to new and useful improvements in a fluid pressure actuator.

Qne object of the invention is to provide a device of the character described specially designed to be attached to a fluid pump for the purpose of controlling the operation thereof.

Another object of the invention is to provide a pressure controlling device of the char acter described specially provided to govern the pressure generator for the purpose of limiting the maximum pressure to be generated; while the device has been specially provided for attachment to fluid pressure pumps it is capable of application generally to fluid pressure generating devices.

With the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts an example of which is given in this specification and illustrated in the accompanying drawing wherein Figure 1 shows a side elevation of the device partly in section shown applied to the discharge line of a fluid pump.

Figure 2 shows a cross sectional view thereof, taken on the line 22 of Figure 1.

Figure 3 shows a fragmentary plan view, partly in section, and

Figure 4 shows a fragmentary side elevation of a modified form of the device.

Referring now more particularly to the drawing, wherein like numerals of reference designate similar parts in each of the figures the numeral 1 designates a pump of any conventional construction having the discharge line 2. The pump may be driven by any suitable motor, preferably an electric motor.

Connected into a fluid pressure chamber of the pump, preferably the discharge line 2, there is a cylinder 3 Whose outer end is enlarged and externally threaded, and in which aligned tracks 7, 7 which are united at their outer endsby the circular end plate 8." There is a disc 9 within the cage which has opposed notches 10, 10 to; receive the tracks sons to retain the disc in the'cage and to permit it to move along said tracks. Adjusting bolts 11, 11 are threaded inwardly throughthe end plate 8 and their innerends form ,abutmentsto limit the outward movement of the disc 9. There is an actuating rod 12 attached to the outer end-of the plunger 4 and which Works through central hearings in the end plate 8 and disc 9 anda strong coil spring 13 surrounds the rod 12 and is interposed between the'outer end of the plunger and the regulated by the adjustment of thebolts 11.

There is a conventional electrical controller 1 1 which controls the current suppliedto'the pump driving motor. This controllerhas not been shown in detail for the reasonfthat its construction, method of operation and use are well knownto those skilled in thea'rt to which it pertains. 1 i

As shown in Figure 1 the controller shaft 15 has an annular flange 16 thereon and ad-- form shown in Figure 4 the outer end of the rod 12 has a lateral pin 21 which works through an oblong slot 22 in the outer end of the controller arm 23. The other end of said arm 23 is fixed to the controller shaft'15.

In operation until the pump pressure exceeds the desired maximum pressure the gov.- erning mechanism described-will remain inactive, but when said maximum pressure is exceeded the plunger 4 will be moved outwardly by said pressure which in turn will operate the arm 23, as the case may be, tooperate the disc 9. The tension on the spring 13 may be. 65211 through said rack 20 and gear 17, or through associated controller '14 to slow down the motor and the pump driven thereby to reduce the pressure to the desired maximum limit. The

maximum pump pressure desired may vary and in order. to control, or vary, this maximum pressure the key 18 may be removed and the controller shaft 15 turned, by the hand wheel 24, fixed thereon, so as to turn the flange 16 relative to the gear 17 and said key 18 then reinserted, with the result that pressure required to affect the controller may be varied as desired.

'Itis'of course obviousthat the shaft 15, or

15, may as well be connected with the throttle valve in case a steam engine, or internal combustion motor is employed to" drive the pump and the pump pressure thus controlled through mechanism similar toth'at hereinabove described. r a

What I claim is a In a device of the character described, a cylinder arranged to receive fiuid' under pressure, a hollow plunger therein whose inner end is'open and whose outer end is permanently closed, the outer end of said cylinder being enlarged, a cage, one end of which is threaded onto said enlarged end ofthe cyline der, said cage having spaced tracks and also having an outer end plate connectingsaid track's, an adjustable abutment in the cage having a slidable engagement withsaid tracks, a yieldable member between the plunger andabutmenhsaidplunger being i balanced between fluid under pressure on one side and said yieldable member on the other side, means connected to said end plate for adjusting said abutment, a rod attached-to the plungerv and working througha bearing in said end plate and forming a guide for the plunger.

In testimony whereof I have signed my 1 name to this specification.

WELDON c. LEONARD. 

